Photo: MMT

MMT has started survey work for the Greenlink interconnector between UK and Ireland, utilizing its survey vessel MV Franklin.

The offshore and nearshore surveying along the proposed route of the electricity link is expected to take approximately 40 days, depending on weather conditions.

Further survey work along the 170 km marine route will be undertaken by vessels MV Seabeam, MV Edda Fonn and RED7 Jack-up rig Seariser 2, the company informed.

The survey area is between Freshwater West, Pembroke, Wales and Baginbun, Co Wexford, Ireland.

The objective of the GMS is to acquire all appropriate data for the confirmation of a preferred route for the High Voltage Direct Current (HVDC) cable system. The surveys will also contribute to the cable burial risk assessment and provide information for the planning applications ensuring that the final route selected is designed sympathetically to the existing marine environment.

Simon Ludlam, project director for Greenlink said: “We are delighted to have appointed the expertise of MMT to undertake the marine survey work for Greenlink. This will collect vital data for the project development and planning applications, helping us determine the best route between Pembrokeshire and Co. Wexford from an environmental, health and safety and economic point of view. The launch of the surveying work today is a significant step in the development of this important electricity infrastructure project.”

Greenlink is a proposed 500MW electrical underground and submarine interconnector, connecting the UK National Grid system at Pembroke substation in Pembrokeshire, Wales to the Irish network at Great Island substation in County Wexford, Ireland.

The privately-financed €400 million project, developed by Greenlink Interconnector Limited, a subsidiary of Element Power, is scheduled to start construction in 2020.

MMT’s geophysical marine survey work comprises intertidal topographic survey, geophysical / hydrographic nearshore and offshore data acquisition, geotechnical investigations with vibrocoring / piston coring and cone penetration testing (PCPT), environmental sampling and imagery, infrastructure crossing survey with ROV, UXO survey, and geotechnical boreholes to inform horizontal directional drilling.

These operations shall provide high resolution and accurate measurements of the bathymetry and seabed features and the shallow geological conditions along the route. This will be supplemented by localized unexploded ordnance (UXO) surveys, environmental sampling and imagery as well as surveys of infrastructure crossings using an ROV.

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